The hex color #c71b4f is a dark color. The web-safe version is Hex
#CC3366. A complementary color is
#38E4B0. The grayscale version is
#666666. A 20% lighter version of the original color is
#FA4E82, and Hex
#94001C is the 20% darker color. If the color is saturated by 10%, you get
#D1144D. If the color is desaturated by 10%, the color
#BD2251 is obtained.